What does the jobs command do in Linux?

The jobs command lists the active jobs (processes) that are running in the current shell session, including those running in the background or stopped.

How do I move a background job to the foreground?

Use 'fg %job_number' (e.g., 'fg %1') to bring a background job to the foreground. If only one job is suspended, 'fg' without arguments will bring it to the foreground.

How do I send a foreground job to the background?

Press Ctrl+Z to suspend a foreground job, then type 'bg' to send it to the background.

jobs Command

The jobs command in Linux is a shell built-in command that lists the active jobs (processes) that are running in the current shell session. These jobs can be running in the foreground, in the background, or stopped.

Syntax

jobs [-l|-p] [jobspec...]

Description

The jobs command is part of job control in Unix-like operating systems, which allows users to manage multiple processes from a single shell. It provides information about the state of these jobs, including their job number, process ID (PID), and status (running, stopped, done).

Common uses include:

Listing all active jobs in the current shell.
Identifying background processes.
Checking the status of suspended jobs.
Managing jobs with fg (foreground) and bg (background) commands.

Common Options

Option	Description
`-l`	List process IDs in addition to the normal information.
`-p`	List only the process ID of the job's process group leader.
`-r`	Restrict output to running jobs.
`-s`	Restrict output to stopped jobs.

Examples

List all active jobs

                        jobs
                        
                        # Example Output:
                        # [1]-  Stopped                 vim
                        # [2]+  Running                 sleep 600 &

Displays all jobs, including stopped and background processes.

List jobs with their process IDs

                        jobs -l
                        
                        # Example Output:
                        # [1]- 12345 Stopped                 vim
                        # [2]+ 12346 Running                 sleep 600 &

Shows the PID for each job in addition to the standard output.

Bring a background job to the foreground

fg %1

Brings job number 1 (as listed by jobs) to the foreground.

Send a suspended job to the background

                        # (Press Ctrl+Z on a running foreground process to suspend it)
                        bg
                    

Sends the most recently suspended job to the background.

Kill a background job

kill %2

Terminates job number 2.